Today’s Parola del giorno is the masculine invariable noun il dietro front, which can mean U-turn or about face (you sometimes see it also as one word il dietrofront).
In military contexts, it can be used as an interjection (Dietro front! = About face), when soldiers marching must turn around to face a commanding officer.
To make a U-turn or to do an about face, use the verb fare: fare dietro front.
You may encounter this expression when a person or group abruptly changes course on something. The expression made the headlines when a political party in Italy abandoned plans to push through amendments on legislation related to Italy’s Green Pass and other COVID-19 legislation.